Fair Values Of Financial Instruments (Tables)

12 Months Ended

Aug. 31, 2012

Fair Values Of Financial Instruments [Abstract]

Financial Assets Measured At Fair Value On A Recurring Basis

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
August 31, 2012
Assets:
Cash equivalents	$	7,784	$	—	$	—	$	7,784
Restricted cash (current)		10,200		—		—		10,200
Restricted cash (noncurrent)		7,903		—		—		7,903
Total	$	25,887	$	—	$	—	$	25,887
August 31, 2011
Assets:
Cash equivalents	$	11,338	$	—	$	—	$	11,338
Restricted cash (current)		12,850		—		—		12,850
Restricted cash (noncurrent)		8,108		—		—		8,108
Total	$	32,296	$	—	$	—	$	32,296